Finished the code for reading the mobo fan speed sensors and importing that into Machinekit as feedback for my thermistor. Roughly calibrated it.

Change the range of the 555 down to 60rpm at room temp as I maxed out the frequency readable by the fan speed sensors at 300c. What's worse is when that happened, it seemed to wrap around... which would have led to a nice smoking hot end as I'm feeding it 80w instead of the normal 30w.

The hotend overkill is in support of plans for a larger cymk capable extruder. Designed an active mixing head with low mixing volume for fast color changes. Missing some parts, but it's coming along.